Work Step by Step
Since $C$ is jointly/directly proportional to $l$, $w$, and $h$, we have: $C=klwh$ We are given: $C=128$ and $l=w=h=2$, so we have: $128=k*2*2*2=8k$ $k=128/8=16$ So the equation is: $C=16lwh$
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